Add schema markup to breadcrumb

What does this MR do?

This MR adds schema markup for breadcrumbs. It adds it using ld+json because the breadcrumb generation logic is so intricate that it's really messy to introduce the microdata tags.

Refs #36844 (closed)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Separation of EE specific content

Related to #36844 (closed)

changelogs/unreleased/36844-fj-add-schema-to-breadcrumb-json.yml

+---
+title: Add schema markup to breadcrumbs
+merge_request: 46991
+author:
+type: added